I have the AEM Big Brake kit front and rear. I have this problem with severe steering wheel vibration and car shuddering around 50-35 mph. Anything higher or lower than these speeds there is no vibration. I just put Axxis pads on all four corners. I was told by a buddy of mine that unbalanced wheels can cause this.
Well I just want a second opinion. My wheels are unbalanced since my wife hit a curb after a car slid into her lane. Ever since then the shaking has happend....only during braking I might add. Also if I hit the Brakes hard there is no vibration period from 100-0 nothing just LOTS of FORCE pulling you forward.